A variable frequency submersible pump for drainage and heat dissipation

Abstract

The present invention is a variable frequency submersible pump with drainage and heat dissipation, belonging to the field of water supply and drainage equipment. Aiming at the problem that the existing variable frequency submersible pump has a complex heat dissipation structure of the frequency converter and is not suitable for use in diving occasions, the technical scheme is as follows: a variable frequency submersible pump with drainage and heat dissipation, including a pump body with a built-in impeller and a motor that drives the impeller to work, one end of the motor is connected to the pump body, and the other end of the motor is provided with a top cover, and a frequency converter is installed in the top cover to control the motor to work, and the water outlet of the pump body is connected to a water pipe extending to the top cover, and a water spray hole facing the top cover is opened on the water pipe. When the water pumped out of the pump body is led out from the water pipe, the water sprayed from the water spray hole is sprayed onto the top cover to cool the top cover and the frequency converter installed in the top cover. The water sprayed onto the top cover cools the top cover and the frequency converter dissipates heat to maintain a good working condition; a water pipe is arranged at the water outlet of the pump body and a water spray hole is opened on the water pipe to spray water on the top cover to dissipate heat, which is conducive to improving the heat dissipation effect.

Description

Technical Field

[0001] The invention belongs to the field of water supply and drainage equipment, and in particular relates to a variable frequency submersible pump for drainage and heat dissipation. Background Art

[0002] A common electric pump includes a pump body with a built-in impeller and a motor that drives the impeller to work. The pump body is provided with a water outlet and a water inlet. When working, water enters the pump body from the water inlet and is ejected from the water outlet after being accelerated by the impeller. In order to reduce the volume, increase the speed and reduce energy consumption, an improved solution of replacing the asynchronous motor with a permanent magnet motor with a frequency converter has emerged. The frequency converter includes a circuit board and a rectifier bridge, an IPM module, a chip, a capacitor, etc. installed on the circuit board. The rectifier bridge and the IPM module have high heat dissipation requirements. If the frequency converter is set in a closed and narrow housing, the heat generated by its work is not easy to dissipate. Excessive heat will damage it, thereby affecting the use of the electric pump. For this reason, the frequency converter of the existing variable frequency electric pump is externally mounted on the electric pump, and the frequency converter is cooled by an additional fan. The structure of the variable frequency electric pump with this heat dissipation structure is relatively complex, and the heat dissipation mechanism of the frequency converter is added, which is not conducive to reducing the volume and simplifying the structure, and it is difficult to be used in diving occasions. Summary of the invention

[0003] In view of the problem that the existing variable frequency submersible pump has a complex inverter heat dissipation structure and is not suitable for use in submersible occasions, the present invention provides a variable frequency submersible pump with drainage heat dissipation, which solves the heat dissipation problem of the inverter by opening a water spray hole on the water outlet pipe of the pump body to spray water on the top cover of the built-in inverter, which is beneficial to improving the heat dissipation effect of the variable frequency submersible pump with drainage heat dissipation.

[0004] The technical solution adopted by the present invention is as follows: A variable frequency submersible pump with drainage and heat dissipation, including a pump body with a built-in impeller and a motor for driving the impeller, one end of the motor is connected to the pump body, and the other end of the motor is provided with a top cover with an inner cavity, and a frequency converter is installed in the inner cavity of the top cover to control the operation of the motor, and a water outlet of the pump body is connected to a water pipe extending toward the top cover for draining water pumped out of the pump body, and a water spray hole facing the top cover is opened on the water pipe. When the water pumped out of the pump body is drained out from the water pipe, the water sprayed out from the water spray hole is sprayed onto the top cover to cool the top cover and the frequency converter installed in the top cover.

[0005] The inverter is installed in the top cover, and the heat generated by its operation will be transferred to the top cover. The water sprayed on the top cover will take away the heat transferred to the top cover, cool the top cover, and then achieve inverter heat dissipation to maintain good working conditions. A water pipe is set at the water outlet of the pump body and a water spray hole is opened on the water pipe to draw out a small amount of water to spray water on the top cover for heat dissipation. This can not only overcome the problem of complex structure caused by the need to set up a heat dissipation device separately for the external inverter, but also help the variable frequency submersible pump with drainage heat dissipation to reduce the volume and simplify the structure, and will not affect the water head too much. In addition, as long as the pump body of the variable frequency submersible pump with drainage heat dissipation is immersed in water and there is water in the water pipe spraying on the top cover through the water spray hole, even if the motor is not immersed in water, the heat dissipation of the top cover can be achieved, which has a wide range of applications.

[0006] The water pumped out by the pump body has a certain water pressure, which exerts a certain pressure on the water pipe wall. When a water spray hole is opened on the water pipe, part of the water is sprayed out at a certain speed under the action of water pressure, which can quickly take away the heat of the top cover, and the heat dissipation effect is very ideal.

[0007] As a perfection of this scheme, the water spray hole is located above the top cover, so that the water sprayed from the water spray hole is sprayed onto the top wall of the top cover, so that the water flow cools the top cover from top to bottom. The top cover is provided with a top wall and a side wall. After the water flow is sprayed onto the top wall of the top cover, it will flow down along the side wall under the action of gravity, increasing the contact area between the water flow and the top cover, and significantly improving the heat dissipation effect.

[0008] Furthermore, a water guide cover is provided between the top wall of the top cover and the water spray hole, and is provided with a water guide cavity and a receiving cavity and a bottom shell located below the receiving cavity. The bottom shell and the top wall of the top cover are arranged in a gap, and the water guide cavity connects the water spray hole and the receiving cavity, and is used to guide water flow to the receiving cavity. The receiving cavity is surrounded above the top wall of the top cover. The water sprayed from the water spray hole enters the receiving cavity through the water guide cavity and flows to the surface of the top cover, and then flows out from the gap between the top wall of the top cover and the bottom shell, cooling the surface of the motor while cooling the top cover. The water guide cover guides the cooling water flow to the top cover, and can also prevent the cooling water flow from splashing around, increasing the contact time between the water flow and the top cover. The water flow flows out from the gap and falls along the side wall of the top cover and the side wall of the motor under the action of gravity, which can also take away the heat generated by the motor and dissipate heat for the submersible pump. Therefore, as long as there is water flow in the receiving cavity, a continuous cooling effect can be produced on the top cover and even the motor.

[0009] Furthermore, a hollow mounting column and a pillar are provided at the connection between the bottom shell and the top wall of the top cover, and a fastener is passed through the mounting column and installed on the pillar to connect the bottom shell and the top cover. Since the water pipe usually has an annular side wall, it is not convenient to install the water guide cover, and therefore the bottom shell is arranged on the top cover to reduce the difficulty of assembly; the mounting column is protrudingly arranged on the lower surface of the bottom shell, the pillar is located on the top wall of the top cover, and the upper surface of the pillar is higher than or flush with the upper surface of the top wall of the top cover, so that the gap is provided between the bottom shell and the top wall of the top cover to ensure that the water in the accommodating cavity remains in a flowing state, thereby ensuring the cooling effect on the top cover.

[0010] Furthermore, at least one protrusion is provided on the lower surface of the bottom shell, and the protrusion is located below the water guiding cavity and is used to separate the bottom shell from the top cover so that a gap is maintained between the top cover and the bottom shell.

[0011] Furthermore, a plurality of triangular support ribs are provided at the connection between the top wall and the side wall of the accommodation cavity, which are evenly distributed in the circumferential direction in the accommodation cavity, and are used to maintain the structural stability of the accommodation cavity. Although the water sprayed out of the water spray hole will be buffered to a certain extent when passing through the water guide cavity, it still has a relatively fast speed and a large impact force. The connection between the top wall and the side wall of the accommodation cavity is bent, which is a weak point under stress. The triangular support ribs have a stable structure and can effectively prevent the cavity wall of the accommodation cavity from being broken by the high-speed water flow.

[0012] Furthermore, the top wall of the top cover is recessed to form a cavity, which is opposite to the accommodating cavity so as to increase the space between the accommodating cavity and the cavity, and increase the time that the water flow stays on the top cover. A plurality of heat sinks are provided in the cavity to increase the contact area between the top cover and the water, thereby effectively improving the heat dissipation effect.

[0013] Furthermore, an anti-cracking sheet is provided at the water spray hole, and the anti-cracking sheet is preferably a copper sheet or a stainless steel sheet to prevent the spray hole from cracking under the action of water pressure.

[0014] Furthermore, the rectifier bridge and IPM module of the inverter are arranged close to the top wall of the top cover, so that the heat of the rectifier bridge and the IPM module is directly transferred to the top wall of the top cover, the heat dissipation speed is faster, and the heat accumulation in the top cover is reduced.

[0015] Furthermore, a handle is provided on the top cover for easy carrying, and a notch for accommodating the handle is provided on the bottom shell of the water-conducting cover to make way for installing the handle.

[0016] The present invention has the beneficial effect that the water sprayed onto the top cover will take away the heat transferred to the top cover, cool the top cover, and then realize the heat dissipation of the inverter to maintain a good working condition. A water pipe is arranged at the water outlet of the pump body, and a water spray hole is opened on the water pipe to draw out a small amount of water flow to spray water on the top cover for heat dissipation. This can not only overcome the problem of complex structure caused by the need to separately set up a heat dissipation device for the external inverter, but also help to reduce the volume and simplify the structure of the variable frequency submersible pump for drainage and heat dissipation, and will not affect the water flow head too much. In addition, as long as the pump body of the variable frequency submersible pump for drainage and heat dissipation is immersed in water, and water is kept in the water pipe to spray onto the top cover through the water spray hole, even if the motor is not immersed in water, the heat dissipation of the top cover can be realized, and it has a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of Example 1;

[0018] Figure 2 It is a structural schematic diagram of Example 2;

[0019] Figure 3 This is a schematic diagram of the structure of another direction of Example 2;

[0020] Figure 4 It is a schematic diagram of the structure of the water guide cover;

[0021] Figure 5 It is a structural schematic diagram of the bottom surface of the water guide cover;

[0022] Figure 6 is a schematic diagram of the structure of the top cover;

[0023] Figure 7 is a schematic diagram of the cross-sectional structure of the top cover;

[0024] In the figure: 1-pump body; 2-motor; 3-top cover; 31-concave cavity; 32-heat sink; 33-pillar; 4-water pipe; 41-water spray hole; 5-water guide cover; 51-bottom shell; 52-water guide cavity; 53-accommodating cavity; 531-triangular supporting rib; 54-mounting column; 55-protrusion; 56-notch; 6-gap; A-rectifier bridge; B-IPM module; C-water outlet of pump body. DETAILED DESCRIPTION

[0025] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0026] Example 1

[0027] The variable frequency submersible pump for drainage and heat dissipation of this embodiment is as follows: Figure 1as well as Figures 4 to 7 As shown, it includes a pump body 1 with a built-in impeller and a motor 2 that drives the impeller to work, one end of the motor 2 is connected to the pump body 1, and the other end of the motor 2 is provided with a top cover 3 with an inner cavity, and the inner cavity of the top cover 3 is installed with a frequency converter to control the operation of the motor 2, and a water outlet C of the pump body is connected to a water pipe 4 extending to the top cover 3 for conducting water pumped out of the pump body 1, and a water spray hole 41 facing the top cover 3 is opened on the water pipe 4. When the water pumped out of the pump body 1 flows out from the water pipe 4, the water sprayed from the water spray hole 41 is sprayed onto the top cover 3 to cool the top cover 3 and the frequency converter installed in the top cover 3.

[0028] The inverter is installed in the top cover 3, and the heat generated by its operation will be transferred to the top cover 3. The water sprayed on the top cover 3 will take away the heat transferred to the top cover 3, so that the top cover 3 is cooled, thereby realizing the heat dissipation of the inverter to maintain a good working condition. A water pipe 4 is arranged at the water outlet C of the pump body, and a water spray hole 41 is opened on the water pipe 4 to draw out a small amount of water flow to spray water on the top cover 3 for heat dissipation. This can not only overcome the problem of complex structure caused by the need to set up a heat dissipation device separately for the external inverter, but also help the frequency conversion submersible pump with drainage and heat dissipation to reduce the volume and simplify the structure, and will not affect the water head too much. In addition, as long as the pump body 1 of the frequency conversion submersible pump with drainage and heat dissipation is immersed in water, and water flow is kept in the water pipe 4 to spray on the top cover 3 through the water spray hole 41, even if the motor 2 is not immersed in water, the heat dissipation of the top cover 3 can still be achieved, and the adaptability is wide. A sealing ring or sealant is provided at the connection between the top cover 3 and the motor 2, and the wiring opening on the top cover 3 and the outer sheath of the wire are sealed to ensure that the inverter is in a sealed state. Air test holes are provided on the outer shells of the top cover 3 and the motor 2 to detect whether the top cover and the motor are sealed.

[0029] The water pumped out by the pump body 1 has a certain water pressure, exerting a certain pressure on the wall of the water pipe 4. When the water spray hole 41 is opened on the water pipe 4, part of the water is sprayed out at a certain speed under the action of the water pressure, which can quickly take away the heat of the top cover 3, and the heat dissipation effect is very ideal. The water pipe 4 is preferably a straight pipe, which reduces the difficulty of processing and is conducive to cost saving; the diameter of the water spray hole 41 is related to the rated flow rate and rated head of the submersible pump.

[0030] The water spray hole 41 is located above the top cover 3, so that the water sprayed from the water spray hole 41 is sprayed onto the top wall of the top cover 3, so that the water flow cools the top cover 3 from top to bottom. The top cover 3 is provided with a top wall and a side wall, and after the water flow is sprayed onto the top wall of the top cover 3, it will flow down along the side wall under the action of gravity, thereby increasing the contact area between the water flow and the top cover 3 and significantly improving the heat dissipation effect.

[0031] The top wall of the top cover 3 is concave to form a cavity 31 to increase the time that the water flow stays on the top cover 3. A plurality of heat sinks 32 are arranged in the cavity 31 to increase the contact area between the top cover 3 and water, thereby effectively improving the heat dissipation effect.

[0032] An anti-cracking sheet (not shown in the figure) is provided at the water spray hole 41. The anti-cracking sheet is preferably a copper sheet or a stainless steel sheet to prevent the spray hole from cracking under the action of water pressure.

[0033] The inverter's rectifier bridge A and IPM module B are arranged close to the top wall of the top cover 3, so that the heat of the rectifier bridge A and the IPM module B is directly transferred to the top wall of the top cover 3, the heat dissipation speed is faster, and the heat accumulation in the top cover 3 is reduced. In this embodiment, a boss is provided on the top wall of the top cover 3 to facilitate the installation of the rectifier bridge A and the IPM module B.

[0034] The water pipe 4 can be a metal pipe or a plastic pipe, wherein the metal pipe is preferably an iron pipe or a steel pipe.

[0035] Example 2

[0036] The variable frequency submersible pump for drainage and heat dissipation in this embodiment is as follows Figures 2 to 7 As shown, it is different from Example 1 in that: a water guide cover 5 is provided between the top wall of the top cover 3 and the water spray hole 41, which includes a water guide cavity 52 and a receiving cavity 5 and a bottom shell 51 located below the receiving cavity 53, and the bottom shell 51 is arranged with a gap between the top wall of the top cover 3, the water guide cavity 52 connects the water spray hole 41 and the receiving cavity 53, and is used to guide water to the receiving cavity 53, and the receiving cavity 53 is surrounded above the top wall of the top cover 3. The water sprayed from the water spray hole 41 enters the receiving cavity 53 through the water guide cavity 52 and then flows to the surface of the top cover 3, and then flows out from the gap 6 between the top wall of the top cover 3 and the bottom shell 51, thereby cooling the surface of the motor 2 while cooling the top cover 3. The water guide cover 5 guides the cooling water to the top cover 3 and can also prevent water from splashing around, thereby increasing the contact time between the water flow and the top cover 3. The water flows out from the gap 6 and falls along the side walls of the top cover 3 and the side walls of the motor 2 under the action of gravity. This can also take away the heat of the motor 2 and dissipate heat for the submersible pump as a whole. Therefore, as long as there is water flow in the accommodating chamber 53, a continuous cooling effect can be exerted on the top cover 3 and even the motor 2.

[0037] A hollow mounting column 54 and a support column 33 are provided at the connection between the bottom shell 51 and the top wall of the top cover 3. The fastener passes through the mounting column 54 and is installed on the support column 33 to connect the bottom shell 51 and the top cover 3. Since the water pipe 4 usually has an annular side wall, it is not convenient for the water guide cover 5 to be installed on the water pipe 4. Therefore, the bottom shell 51 is arranged on the top cover 3 to reduce the difficulty of assembly. The mounting column 54 is protrudingly arranged on the lower surface of the bottom shell 51, and the support column 33 is located on the top wall of the top cover 3, and the upper surface of the support column 33 is higher than or flush with the upper surface of the top wall of the top cover 3, so that the bottom shell 51 and the top wall of the top cover 3 are provided with the gap 6 to ensure that the water in the accommodating cavity 53 remains in a flowing state, ensuring the cooling effect of the top cover 3.

[0038] The accommodating chamber 53 is a cavity with an opening facing downwards. The accommodating chamber 53 of this structure can make the water flow from the water guiding chamber 52 converge and flow downwards.

[0039] Two protrusions 55 are provided on the lower surface of the bottom shell 51 . The protrusions 55 are located below the water guiding cavity 52 and are used to separate the bottom shell 51 from the top cover 3 so that a gap is maintained between the top cover 3 and the bottom shell 51 .

[0040] A plurality of triangular support ribs 531 are provided at the connection between the top wall and the side wall of the accommodating cavity 53, which are evenly distributed in the accommodating cavity 53 in the circumferential direction, and are used to maintain the structural stability of the accommodating cavity 53. Although the water sprayed out of the water spray hole 41 is buffered to a certain extent when passing through the water guide cavity 52, it still has a relatively fast speed and a relatively large impact force. The connection between the top wall and the side wall of the accommodating cavity 53 is bent, which is a weak point under stress. The triangular support ribs 531 have a stable structure and can effectively prevent the cavity wall of the accommodating cavity 53 from being broken by the high-speed water.

[0041] In this embodiment, the concave cavity 31 is opposite to the accommodating cavity 53 to increase the space between the accommodating cavity 53 and the concave cavity 31. The top cover 3 is provided with a handle for easy carrying, and the bottom shell 51 of the water guide cover 5 is provided with a notch 56 for accommodating the handle, making way for installing the handle.

[0042] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A variable frequency submersible pump for drainage and heat dissipation, characterized in that: The invention comprises a pump body (1) with a built-in impeller and a motor (2) for driving the impeller to work, one end of the motor (2) is connected to the pump body (1), the other end of the motor (2) is provided with a top cover (3) with an inner cavity, the inner cavity of the top cover (3) is provided with a frequency converter to control the operation of the motor (2), the water outlet (C) of the pump body is connected to a water pipe (4) extending toward the top cover (3) for guiding out the water pumped out by the pump body (1), the water pipe (4) is provided with a water spray hole (41) facing the top cover (3), when the water pumped out by the pump body (1) flows out from the water pipe (4), the water sprayed out from the water spray hole (41) is sprayed onto the top cover (3), so as to cool down the top cover (3) and the frequency converter installed in the top cover (3), the water spray hole (41) is located above the top cover (3), so that the water sprayed out from the water spray hole (41) is sprayed onto the top wall of the top cover (3), so that the water flows from the top to the bottom. The top cover (3) is cooled downwardly, the top cover is provided with a top wall and a side wall, and after the water flow is sprayed onto the top wall of the top cover, it will flow down along the side wall under the action of gravity; a water guide cover (5) is provided between the top wall of the top cover (3) and the water spray hole (41), and the water guide cover (5) is provided with a water guide cavity (52) and a receiving cavity (53) and a bottom shell (51) located below the receiving cavity (53), the bottom shell (51) and the top wall of the top cover (3) are arranged in a gap, the water guide cavity (52) is connected to the bottom shell (51) and the bottom shell (51) is provided with a water guide cavity (52) and a receiving cavity (53) The water spray hole (41) and the accommodating chamber (53) are connected to guide water to the accommodating chamber (53). The accommodating chamber (53) is surrounded above the top wall of the top cover (3). The water sprayed from the water spray hole (41) enters the accommodating chamber (53) through the water guide chamber (52) and then flows to the surface of the top cover (3). Then, the water flows out from the gap (6) between the top wall of the top cover (3) and the bottom shell (51), thereby cooling the top cover (3) and the surface of the motor (2) at the same time.

2. The variable frequency submersible pump for drainage and heat dissipation according to claim 1, characterized in that: A hollow mounting column (54) and a support column (33) are provided at the connection between the bottom shell (51) and the top wall of the top cover (3); a fastener passes through the mounting column (54) and is installed on the support column (33) to connect the bottom shell (51) and the top cover (3); the mounting column (54) is protruding from the lower surface of the bottom shell (51); the support column (33) is located on the top wall of the top cover (3); and the upper surface of the support column (33) is higher than or flush with the upper surface of the top wall of the top cover (3), so that the gap (6) is provided between the top walls of the bottom shell (51) and the top cover (3).

3. The variable frequency submersible pump for drainage and heat dissipation according to claim 2, characterized in that: The lower surface of the water guide cover (5) is provided with at least one protrusion (55), and the protrusion (55) is located below the water guide cavity (52) and is used to separate the bottom shell (51) and the top cover (3).

4. The variable frequency submersible pump for drainage and heat dissipation according to claim 3, characterized in that: A plurality of triangular support ribs (531) are provided at the connection between the top wall and the side wall of the accommodating cavity (53), and are evenly distributed in the circumferential direction in the accommodating cavity (53).

5. The variable frequency submersible pump for drainage and heat dissipation according to claim 1, characterized in that: The top wall of the top cover (3) is concave to form a cavity (31), the cavity (31) is opposite to the accommodating cavity (53), and a plurality of heat sinks (32) are arranged in the cavity (31) to increase the contact area between the top cover (3) and water.

6. The variable frequency submersible pump for drainage and heat dissipation according to claim 1, characterized in that: An anti-cracking sheet is arranged at the water spray hole (41), and the anti-cracking sheet is a copper sheet or a stainless steel sheet.

7. The variable frequency submersible pump for drainage and heat dissipation according to claim 1, characterized in that: The rectifier bridge (A) and the IPM module (B) of the frequency converter are arranged close to the top wall of the top cover (3).

8. The variable frequency submersible pump for drainage and heat dissipation according to claim 1, characterized in that: The top cover (3) is provided with a handle. A notch (56) for accommodating a handle is provided on the bottom shell (51) of the water guide cover (5).

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